Weatherproof direction-finding antenna



4 3 8 CROSS REFERENCE SEAR R WEATHERPROOF DIRECTION FINDING ANTENNA Filed April 5. 1950 INVENTOR AUGUS LE A ATTORNEY Patented Jan. 3, 1933 UNITED STATES PATENT OFFICE FUR DRAHTLOSE TELEGRAPHIE M. B. IL,

GERMANY 0F BERLIN, GERMANY, A CORPORATION OF WEATHEBPROOF DIRECTION -FINDING ANTENNA Application filed April 5, 1930, Serial No. 441,947, and in Germany May 8, 1929.

It is known in the prior art to enclose the turns of direction-finding antenna inside a weather-proof protective frame of round or polygonal, say, square shape, the constituent sections of said frame being united with one another by separate joining pieces to result in a stiff structure. The mounting of antenna turns inside such protective frames is rendered diflicult on account of the fact that it is necessary to shift or thread the wires not only through all of the constituent frame parts, but also through the said connecting pieces.

Now, the present invention discloses ways and means of facilitating the assembly of the weather-proof direction-finder antenna in that the pushing of the antenna or coil turns through the connecting pieces is obviated in that the latter consist of pairs of shell pieces adapted to be attached together.

In mounting the loop the wire can be shifted quite readily through each of the separate sections or parts of the protective frame consecutively. Thereupon the whole is brought into the desired final shape and is stilfened by applying the connecting or joining pieces the constituent shells of which are firmly united together.

A direction-finder coil or loop is illustrated in the accompanying drawing. Fig. 1 shows a finished square protective frame according to the invention comprising straight limb pieces a and the angular knees I), and each of these latter consists of two shells 00 as shown in Fig. 2.

Of course, care should be taken so that the protective frame will form no closed conducting loop in electrical respect. For this purpose, one of said connecting pieces or one of the pipe pieces or part thereof may be made of insulation material.

I claim:

1. A shield for a loop antenna including a plurality of metallic tubular members, and means for joining said tubular members together comprising split members adapted to be clamped over the ends of said tubular members.

2. Means for substantially completely enclosing a directional aerial system in an tially closed composite member, and means for retaining said members in position comprising split oints adapted to be clamped over the adjacent ends of the tubular members.

AUGUST LEIB. 

